- Correspondence to Dr Kate Brain, Division of Population Medicine, School of Medicine, Cardiff University, Heath Park, Cardiff CF14 4YS, UK;
- Received 4 November 2016
- Revised 7 February 2017
- Accepted 27 February 2017
- Published in print 1 October 2017.
- Published online 13 September 2017.
- Published first 14 July 2017.
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